Systematic studies on the sorption and diffusion behaviors of gases in low-molar-mass liquid crystalline substances (LCs) have been performed. The experiments were carried out in different gas atmospheres over temperature ranges which covered the phase transitions of the LCs under investigation, and at pressures of up to 15 bar, The equilibrium concentration and the diffusion coefficient of the sorbed gases were found to be strongly dependent on the LC phase state, gas type and gas pressure and temperature. Furthermore, the influence of gases on the phase transition temperatures of LCs and the reversibility of gas sorption have been studied.